flipud

Create a column vector.

A=(1:10)'

A = 10×1

     1
     2
     3
     4
     5
     6
     7
     8
     9
    10

Use flipud to flip the elements of A in the vertical direction.

B = flipud(A)

B = 10×1

    10
     9
     8
     7
     6
     5
     4
     3
     2
     1

The order of the elements in B is reversed compared to A.

Create a 3-by-3 cell array of characters.

A = {'a' 'b' 'c'; 'd' 'e' 'f'; 'g' 'h' 'i'}

A = 3x3 cell
    {'a'}    {'b'}    {'c'}
    {'d'}    {'e'}    {'f'}
    {'g'}    {'h'}    {'i'}

Change the order of the rows in the vertical direction by using flipud.

B = flipud(A)

B = 3x3 cell
    {'g'}    {'h'}    {'i'}
    {'d'}    {'e'}    {'f'}
    {'a'}    {'b'}    {'c'}

The order of the first and third rows of A is switched in B, while the second row remains unchanged.

Create a multidimensional array.

A = cat(3, [1 2; 3 4], [5 6; 7 8])

A = 
A(:,:,1) =

     1     2
     3     4


A(:,:,2) =

     5     6
     7     8

A is an array of size 2-by-2-by-2.

Flip the elements on each page of A in the vertical direction.

B = flipud(A)

B = 
B(:,:,1) =

     3     4
     1     2


B(:,:,2) =

     7     8
     5     6

The result, B, is the same size as A, but the vertical order of the elements is flipped. The operation flips the elements on each page independently.